One year ago today, a group of Marines, U.S. soldiers and Afghan security forces were pinned down in a kill zone near Ganjgal, Afghanistan, a remote village in the unforgiving, mountainous terrain of Kunar province. At this point, the basic details of what occurred that day are well known. Repeatedly denied air support and artillery by officers at a nearby forward operating base, they were left to fend for themselves against more than 100 well-entrenched insurgent fighters. Three Marines and a Navy corpsman were killed on the battlefield, and a U.S. soldier died Oct. 7, 2009, from medical complications that…